Automatic cutting machine



April 29, 1952 o. AMlET 2,594,708

AUTOMATIC CQTTING MACHINE Filed Aug. 1, 1947 2 SHEETSSHEET 1 F16. i Q

In men for April 29, 1952 q ET 2,594,708

AUTOMATIC CUTTING MACHINE Filed Aug. 1, 1947 2 SHEETS-SHEET 2 III iWen/ar v (9. Aim/6 Patented Apr. 29, 1952 AUTOMATIC CUTTING MACHINE Oscar Amiet, La Chaux de Fonds, Switzerland, assignor to Mistress Albert Murback, Colombier,

Switzerland Application August 1, 1947, Serial No. 765,581 In Switzerland June 14, 1946 Section 1, Public Law 690, August 8, 1946 Patent expires June 14, 1966 The present invention refers to anautomatic cutting machine, of the type in which a toolholder carrying at least one cutting tool is mounted revolvably around the axis of the bar to be cut, and comprising a mechanism for the automatic control of the radial displacement of the tool. This machine is characterized by the fact that the automatic bar feeding device comprises two adhesion feeding wheels, between which the bar is pressed and one of which, at least, is a driving wheel, and by the fact that the driving adhesion wheel is operatively connected with a feeding lever of said bar feeding device, on the one hand, and with a blocking element on the other hand, whilst cams are operatively connected with said feeding lever and said blocking element, in such a way as to operate them alternatively, whereby the driving wheel is blocked during the return movement of the feeding lever.

The attached drawing represents schematically and partially, by way of example, one embodiment of the invention.

Fig. 1 is a partial view in elevation with parts in section of this embodiment.

Fig. 2 is a front view of the tool-holder.

Fig. 3 is a cross-section along line III-III of Fig. 1.

Fig. 4 is a cross-section of the feeding device along line IV-IV of Fig. l. .1

The cutting machine comprises a frame I on which is mounted a revolving tool-holder 2 and a camshaft 4 for the automatic control of a bar feeding device and of the mechanism controlling the radial displacement of the tools. The toolholder carries two cutting tools 5 and can oscillate around a gudgeon-pivot 6, under the action of a lug- I, against which it is applied by means of a return spring 8. screwed tight on a hub 9 mounted on a ballbearing I0 and driven by a belt II.

In the front center of this hub is provided a guiding die I2, and in the rear center there is an axial pusher I3 with an inner return spring I3a. This pusher extends forwards in the shape of a lug I, passing through a longitudinal gap I2b cut in periphery of a sleeve I2a forced in the hub 9. Thus lug I has one side whichis straight, in a longitudinal direction, and in contact with a corresponding shoulder lb of the tool-holder 2. The opposite side of the lug I is oblique inrespect with the longitudinal axis and can slide against the corresponding side of the gap I21), which has the same obliquity, By this The gudgeon pivot 6 is 4 Claims. (01. 2963) means, the axial pusher I3 controls the radial motion of the tools 5.

A tube I4, placed in the prolongation of the guiding die I2, is fixed on a support I5 secured on the frame I. A gutter I6 collects the pieces 25 which have been cut from the bar, and directs them away from the chips, which fall below the cutting tools. 7

The axial pusher I3 is moved by a cranked lever I'I pivoted in Ila and carrying a roller IIb cooperating with said axial pusher and a roller I'Ic cooperating with a cam I8.

The machine comprises two bar-feeding wheels I02 and I03, with grooves of semi-circular crosssection, between which is pressed the bar IOI to be cut. The wheel I03 is keyed on a shaft I03a at the other end of which is keyed an adhesion wheel I04 which bears on a cylinder I05. This cylinder forms one endof a hollow shaft I02a-on Whose other end is keyed the wheel I02. The shaft I03a is journalled in ball-bearings I06 mounted in a lever I01. This lever is pivoted on a universal joint comprising a cross-shaft I30, one branch of which is journalled in heartshaped eyelets I32 of lever I01 whilst the other branch is journalled in similar heart-shaped eyelets I3I of the frame III. The lever I0I carries an adjusting screw I I 0 pressing through a spring I09 on the frame III and enabling to adjust the adhesion pressure of the wheels I03 and I04 on the wheel I02 and the cylinder I05. The pressure I03I02 is obviously equal to the pressure I04-I05, since these pressures are equalized by the universal joints I30.

The wheel I02 and its cylinder I05 are journalled on ball bearings I I 2 mounted on the frame III. The shaft II3a of the feeding lever II3 can rotate in the axial bore of the hollow shaft IBM and effectuate also a slight axial sliding motion. At its end opposite the lever II3, the shaft I I3a carries a feedin clutch cone I I4 which tends to engage itself in a corresponding inner cone in the cylinder I05 under the action of a spring II5. A second inner cone is provided in cylinder I05 to cooperate with a blocking cone- I I6 mounted on a shaft I I9 which is apt to slide in an axial bore of the shaft' I I3a. This cone presents a retaining fork III which prevents it from rotating. This fork engages on a finger II8 which is secured on the frame III and only allows said blocking cone to move axially. This cone H6 is mounted slidably'; also on the shaft I I9; This shaft presents a shoulder I I9a against which bears a return spring I20 of cone II6, this cone is thus applied against the middle part I24 of the shaft II9. g

The engagement of the cone I IS with the cylinder I85 is operated by means of a lever IZI pivoted in I22, under the action of a cam I23. This cam is secured on a shaft 4, journalled in the frame HI and driven by a worm screw I28. At the opposite end of this shaft is keyed the feeding cam I26. On the drawing, the feeding cone H4 is shown in its engaged position, under the action of the spring H5.

The operation of this cutting machine is as follows: In order to manufacture the pieces 25, for instance, one of the cutting tools is set to turn the cylindrical part of small diameter, while the bar advances under the action of the wheels I82 and N13. The other cutting tool then cuts off the terminated piece by advancing radially under the action of the lug I of the axial pusher i3, operated by the lever II, which is actuated itself by the cam I8.

And the same cycle starts again, the finished pieces 25 passing through the tube I 4 to fall along the gutter I6, away from the heap of chips below the tools.

The advantage of this machine is that the bar does not revolve. One can cut bars of any shape: The guiding die I2 has a cross-section corresponding to that of the bar to be cut.

The operation of the feeding device is as follows:

,The lever IIS still remains a certain amount of time in the same position, on account of a cylindrical part of the cam I 26. At this moment, the cam I23 operates the lever I21, which pushes the axis I It in axial direction, whereby the spring 20 presses the blocking cone H6 into the cylinder I95. The axis H9 is thrust more deeply by the lever I2I, this increasing the pressure of spring I28. The middle part I24 liberates the feeding clutch cone I III. by compressing the spring H5. It is therefore only after the blocking of the cylinder I65 by the cone H6, that the cone I I4 is liberated from the cylinder, and during all these movements the lever H3 has been resting on the cylindrical part of the cam I26. At this moment this cam allows the lever H3 to come back to its starting position.

Afterwards, the cam I23 allows the lever I2l to move backwards under the action of the spring I20. The movements which have just been described then develop themselves again in the opposite direction. The cone I I4 is engaged into the cylinder I95, then the blocking cone I I6 is liberated under the action of the spring I25, the pressure of spring I28 being neutralized by the middle I24 of the axis H9.

Alternatively, one can provide a single driving wheel presenting a groove of trapezoidal cross-section and cooperating with a spring roller.

One can obviously interchange the elements operating the feeding clutch and the blocking cone. Instead of cones, one could also use any other surface of revolution, or disk, etc.

The grooves of the adhesion wheels pressing.

the bar could have any other cross-section.

What I claim is:

1. A rod feed device for an automatic cutting machine, comprising, in combination, two peripherally grooved adhesion feeding wheels between which passes the bar to be cut, a yieldable biasing means for said feeding wheels whereby said bar is elastically pressed'between said wheels, aw swingingfeeding levenan axially slidable driving cone dependent on said lever, a first inner cone dependent on one of said feeding wheels, said one of said wheels being a driving wheel for the bar, a spring urging said driving cone into engagement with said inner cone, a first cam operating said feeding lever, a non-revolvable, axially slidable blocking cone, a second lever axially controlling both said driving cone and said blocking cone, a second cam operating said second lever, a second inner cone dependent on said driving wheel and adapted to cooperate with said blocking cone, the form of both of said cams being such that during the forward movement of the swinging lever the blocking cone is disengaged and said driving wheel is driven by said swinging lever and during the return movement of said lever, said driving wheel is blocked by the blocking cone, the blocking cone being engaged before the driving cone is liberated and being liberated after the driving cone has been engaged.

2. A rod feed device for an automatic cutting machine comprising, in combination, two peripherally grooved adhesion feeding wheels between which passes the bar to be cut, a yieldable biasing means for said feeding wheels whereby said bar is elastically pressed between said wheels, two shafts each carrying one of said feeding wheels, two second adhesion wheels arranged in contact with one another each secured on one of said shafts, a lever in which is journalled one of said shafts, a universal joint for fixing said lever, an adjusting screw for balancing the pressure on the feeding wheels and on the second adhesion wheels, a swinging feeding lever, a friction clutch through which said feeding lever is operatively connected to at least one of the feeding wheels, said wheel to which said feeding lever is connected being a driving wheel for the bar, a first cam operating said feeding lever, a friction blocking device for said driving wheel, a second cam operating said blocking device, whereby the driving wheel is driven by the swinging lever during its forward movement and is blocked during the return movement of said feeding lever.

3. A mechanical movement for driving the feeding wheels of an automatic cutting machine comprising, in combination, a swinging feeding lever, an axially slidable driving cone dependent on said lever, a first inner cone and a second inner cone connected to one of said feeding wheels, a spring urging said driving cone into engagement with said first inner cone, a first cam operating said feeding lever, a non-reVolvable, axially slidable blocking cone, a second lever axially controlling said driving cone and said blocking cone, a second cam operating said second lever, said second inner cone being adapted to cooperate with said blocking cone, the form of both cams being such that during the forward movement of the swinging lever the blocking cone is disengaged and one of said wheels is driven by said swinging lever and that during the return movement of said lever, said wheel is blocked by the blocking cone, the blocking cone being engaged before the driving cone is liberated and being liberated after the driving cone has been engaged.

4. A mechanical movement for driving the feeding wheels of an automatic cutting machine comprising, in combination, two shafts each adapted to carry one of said feeding wheels, two adhesion wheels arranged in contact with one another each secured on one of said shafts, a lever in which is journalled one of said shafts, a universal joint for fixing said lever, an adjusting screw for balancing the pressure on the feeding wheels and on the adhesion wheels, a swinging feeding lever, a friction clutch through which said lever is adapted to be operatively connected to at least one of the feeding wheels, a first cam operating said lever, a friction blocking device for the wheel actuated by said lever, a second cam operating said blocking device, whereby the wheel is driven by the swinging lever during its forward movement and is blocked during the return movement of said lever.

OSCAR AMIET.

REFERENCES CITED The following references are of record in the file of this patent:

Number Number UNITED STATES PATENTS Name Date Claussen Aug. 29, 1893 Grant Mar. 20, 1894 Spencer May 28, 1895 Crombie Nov. 5, 1895 Swasey Feb. 6, 1900 Hundhausen Mar. 27, 1900 Granz Nov. 24, 1914 Gest Nov. 11, 1941 Slovak June 5, 1945, Bristol Apr. 16, 1946 Maltby Jan. 28, 1947 FOREIGN PATENTS Country Date Germany July 19, 1928 

